<table border="1" class="dataframe">
  <thead>
    <tr>
      <th></th>
      <th>columns.name.0</th>
      <th colspan="2" halign="left">a</th>
    </tr>
    <tr>
      <th></th>
      <th>columns.name.1</th>
      <th>b</th>
      <th>c</th>
    </tr>
    <tr>
      <th>index.name.0</th>
      <th>index.name.1</th>
      <th></th>
      <th></th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th rowspan="2" valign="top">a</th>
      <th>b</th>
      <td>0</td>
      <td>0</td>
    </tr>
    <tr>
      <th>c</th>
      <td>0</td>
      <td>0</td>
    </tr>
  </tbody>
</table>
